Abstract
Influence of carbon concentration on chemical behavior of energetic deuterium implanted into carbon-contained boron film was investigated by XPS and TDS. Total deuterium retention and the retention of deuterium trapped by boron were decreased as the carbon concentration was increased, although that by carbon was increased. 60% of the total deuterium retention was trapped by carbon for the sample at the carbon concentration of around 30%, suggesting that deuterium had more affinity with carbon than boron. Above the carbon concentration of 20%, the chemical states of carbon were clearly changed, which led to the deuterium trapping by carbon, indicating the chemical structure change would make a large influence on D trapping. It can be said that deuterium trapped by carbon should be taken into consideration for the evaluation of tritium inventory in the carbon-contained boron film with the carbon concentration above 20%.
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